Effect of Disturbances on the Operation Process of a Methane-Fueled Free-Piston Engine Generator

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  • 1. School of Mechanics, North China University of Water Resources and Electric Power, Henan 450045, China
    2. Henan International Joint Laboratory of Thermo-Fluid Electro-Chemical System for New Energy Vehicle, Henan 450045, China
    3. School of Astronautics, Beihang University, Beijing 102206, China

网络出版日期: 2023-11-28

基金资助

This work is supported by the National Natural Science Foundation of China (No. 52076007) and Project of Educational Commission of Henan Province of China (No. 22A470007 and No. 20A470008).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Effect of Disturbances on the Operation Process of a Methane-Fueled Free-Piston Engine Generator

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  • 1. School of Mechanics, North China University of Water Resources and Electric Power, Henan 450045, China
    2. Henan International Joint Laboratory of Thermo-Fluid Electro-Chemical System for New Energy Vehicle, Henan 450045, China
    3. School of Astronautics, Beihang University, Beijing 102206, China

Online published: 2023-11-28

Supported by

This work is supported by the National Natural Science Foundation of China (No. 52076007) and Project of Educational Commission of Henan Province of China (No. 22A470007 and No. 20A470008).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

本文通过实验方法研究了外部扰动对自由活塞内燃发电机(Free-piston engine genertor,FPEG)运行过程的影响。实验中引入了四个典型的干扰源,即外部负载的突变、混合气流量波动、气缸的随机失火和外部弹性撞击,并将这些扰动源分别施加于稳定运行的FPEG。实验结果表明,FPEG成功地实现了带负载下的连续稳定运行。最大瞬时功率为127W,平均有效功率为38.9W。当外部负载瞬间断开时,发动机运行频率从26.7 Hz增加到31.3 Hz。扰动区感应电压、压力和压缩比的波动幅度分别为18.9%、24.7%和52.2%。相比之下,当外部负载瞬间连接时,相应值的波动幅度分别为42.2%、31.3%和64.3%,表明外部负载突然接入对FPEG运行稳定性的影响更大。尽管FPEG遇到外部负载的突变,FPEG仍能恢复稳定运行,显示FPEG具有良好的抗干扰能力。与提高混合气流量相比,降低混合气流量对发动机运行稳定性的扰动影响更大。尽管气缸内部随机失火会导致活塞位移和气缸压力的显著波动,但FPEG不会停止运行,而是作为单活塞发动机继续工作。实验还表明,轻微碰撞事故可对发动机运行稳定性产生不利影响,但不会导致FPEG停机。然而,严重的碰撞事件则会导致缸内失火和停机事故。

本文引用格式

HUANG Fujun, XIAO Huihui, GUO Shuman, WANG Lijun, YANG Zhenzhong, KONG Wenjun . Effect of Disturbances on the Operation Process of a Methane-Fueled Free-Piston Engine Generator[J]. 热科学学报, 2023 , 32(2) : 881 -896 . DOI: 10.1007/s11630-023-1751-9

Abstract

In this paper, the effect of disturbances on the operation process of a methane-fueled free-piston engine generator (FPEG) was experimentally investigated. Four disturbance sources, namely step change of external load, mixture flow rate fluctuation, random misfire of a cylinder, and elastic collision, were identified and applied to the FPEG. The results showed that the FPEG successfully achieved a steady-state operation with load. The maximum instantaneous electric power of 127 W and the average effective electric power of 38.9 W were obtained. When an external load was instantaneously disconnected, the engine frequency increased from 26.7 Hz to 31.3 Hz. The fluctuation amplitudes of induced voltage, pressure and compression ratio were 18.9%, 24.7% and 52.2% respectively in the disturbance. By contrast, when the external load was instantaneously connected, the corresponding values were 42.2%, 31.3% and 64.3% respectively, indicating that the instantaneous external load connection had a greater disturbance impact on the FPEG operation stability. Despite encountering the step change of external load, the FPEG can still restore stable operation and show good anti-disturbance ability. Compared with increasing mixture flow rate, reducing the mixture flow rate has a greater disturbance impact on the engine operation stability. Although random misfire of a cylinder will cause remarkable fluctuations in piston displacement and cylinder pressure, the FPEG will not stop running, but continues to work as a single-piston engine. Minor collision event may adversely affect the stability of engine operation, but will not lead to the FPEG shutdown. However, serious collision event may lead to ignition failure and shutdown accident.

参考文献

[1] Jhang S.R., Chen K.S., Lin S.L., et al., Reducing pollutant emissions from a heavy-duty diesel engine by using hydrogen additions. Fuel, 2016, 172: 89–95.
[2] Sun Y.Z., Cai T., Zhao D., Thermal performance and NOx emission characteristics studies on a premixed methane-ammonia-fueled micro-planar combustor. Fuel, 2021, 291: 120190. 
[3] Zhang W.K., Kong W.J., Sui C.J., et al., Effect of hydrogen-rich fuels on turbulent combustion of advanced gas turbine. Journal of Thermal Science, 2022, 31(2): 561–570.
[4] Du N., Kong W.J., Experimental and numerical studies of a microscale internal combustion swing engine (MICSE). Journal of Thermal Science, 2021, 30(5): 1705–1717.
[5] Pan J.F., Cheng B., Tao J.Y., et al., Experimental investigation on the effect of blending ethanol on combustion characteristic and idle performance in a gasoline rotary engine. Journal of Thermal Science, 2021, 30(4): 1187–1198.
[6] Moon S., Potential of direct-injection for the improvement of homogeneous-charge combustion in spark-ignition natural gas engines. Applied Thermal Engineering, 2018, 136: 41–48.
[7] Xiao H., Wang Z.L., Valera-Medina A., et al., Study on characteristics of co-firing ammonia/methane fuels under oxygen enriched combustion conditions. Journal of Thermal Science, 2018, 27(3): 270–276.
[8] Zheng J.B., Wang J.H., Zhao Z.B., et al., Effect of equivalence ratio on combustion and emissions of a dual-fuel natural gas engine ignited with diesel. Applied Thermal Engineering, 2019, 146: 738–751.
[9] Hou X.C., Zhang H.G., Zhao T.L., et al., Study on the control strategy of free piston expander-linear generator used for organic Rankine cycle waste heat recovery. Journal of Thermal Science, 2021, 30(2): 585–597.
[10] Jaakko L., Juha H., Petri S., et al., Fluid dynamic modeling of a free piston engine with labyrinth seals. Journal of Thermal Science, 2010, 19(2): 141–147.
[11] Jia B.R., Tian G.H., Feng H.H., et al., An experimental investigation into the starting process of free-piston engine generator. Applied Energy, 2015, 157: 798–804.
[12] Woo Y., Lee Y., Lee Y., The performance characteristics of a hydrogen-fuelled free piston internal combustion engine and linear generator system. International Journal of Low-Carbon Technologies, 2009, 4(1): 36–41.
[13] Jia B.R., Smallbone A., Mikalsen R., et al., Disturbance analysis of a free-piston engine generator using a validated fast-response numerical model. Applied Energy, 2017, 185: 440–451.
[14] Mikalsen R., Roskilly A.P., The control of a free-piston engine generator. Part 2: engine dynamics and piston motion control. Applied Energy, 2010, 87(4): 1281–1287.
[15] Huang F.J., Kong W.J., Experimental study on the operating characteristics of a reciprocating free piston linear engine. Applied Thermal Engineering, 2019, 161: 114131.
[16] Huang F.J., Kong W.J., Effect of hydrogen addition on the operating characteristics of a free piston linear engine. International Journal of Hydrogen Energy, 2020, 45(30): 15402–15413.
[17] Huang F.J., Kong W.J., Experimental investigation of operating characteristics and thermal balance of a miniature free-piston linear engine. Applied Thermal Engineering, 2020, 178: 115608. 
DOI: 10.1016/j.applthermaleng.2020.115608.
[18] Huang F.J., Kong W.J., Effects of hydrogen addition on combustion characteristics of a free-piston linear engine with glow-assisted ignition. International Journal of Hydrogen Energy, 2021, 46(44): 23040–23052.
[19] Johansen T.A., Egeland O., Johannessen E.A., et al., Free-piston diesel engine timing and control-toward electronic cam-and crankshaft. IEEE Transactions on Control Systems Technology, 2002, 10(2): 177–190.
[20] Mao J.L., Zuo Z.X., Feng H.H., Parameters coupling designation of diesel free-piston linear alternator. Applied Energy, 2011, 88(12): 4577–4589.
[21] Menon S., The scaling of performance and losses in miniature internal combustion engines. University of Maryland, Washington, American, 2010.
[22] Moffat R.J., Using uncertainty analysis in the planning of an experiment. Journal of Fluids Engineering, 1985, 107: 173–178.

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